Based on units in service from the 1950s to late 1960s with:
• NEW – Rectangular cab vent
• NEW – Dual lens lower headlight in door
• Gyralight in upper headlight housing
• Brass Nathan P5 air horn
• Horizontal air grilles
• Wire grabs & etched metal platform on nose
• Flush numberboards
• Single steam generator
• Skirted fuel tank
• Freight-type pilot
• Winterization hatches